Black/Green = Reverse. Blue = Brake Output. Yellow = Left Turn/Brake. Green = Right Turn/Brake. Brown = Running Lights. For a new 7-way trailer connector, I recommend using the Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer Socket part # PK12-707E because all you need to do is strip the jacket off the ends of the above wires and then Related searches for 2008 f250 trailer wiring diagram f250 trailer plug wiring diagramford f250 trailer wiringf250 7 pin plug diagramf250 trailer wiring harness diagramford f350 trailer wiring diagramford f250 trailer plug wiringford trailer plug wiring diagramford truck trailer plug diagram